This plugin is integration of ReferralCandy with woocommerce, wp-ecommerce and jigoshop-ecommerce stores.
This plugin do not need any development skills.
You only need to install the plugin and provide the API keys from referralCandy.
When you do it, the next time any customer buys on your website will get the referral popup, He can share his link with his friends and will be rewarded according to your plan.